diff --git a/notes/Hadoop-YARN.md b/notes/Hadoop-YARN.md
index e3651ec..75f6c08 100644
--- a/notes/Hadoop-YARN.md
+++ b/notes/Hadoop-YARN.md
@@ -1,32 +1,33 @@
 # Hadoop-YARN
-
<nav>
-<a href="#一hadoop-yarn-简介">一、hadoop yarn 简介</a><br/>
-<a href="#二YARN架构">二、YARN架构</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#1-ResourceManager"> 1. ResourceManager</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#2-ApplicationMaster">2. ApplicationMaster </a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#3-NodeManager">3. NodeManager</a><br/>
-<a href="#三YARN工作原理简述">三、YARN工作原理简述</a><br/>
-<a href="#四YARN工作原理详述">四、YARN工作原理详述</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#1-作业提交">1. 作业提交</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#2-作业初始化">2. 作业初始化</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#3-任务分配">3. 任务分配</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#4-任务运行">4. 任务运行</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#5-进度和状态更新">5. 进度和状态更新</a><br/>
-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#6-作业完成">6. 作业完成</a><br/>
-<a href="#五提交作业到YARN上运行">五、提交作业到YARN上运行</a><br/>
-</nav>
-
+
+<nav>
+<a href="#一hadoop-yarn-简介">一、hadoop yarn 简介</a><br/>
+<a href="#二YARN架构">二、YARN架构</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#1-ResourceManager"> 1. ResourceManager</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#2-ApplicationMaster">2. ApplicationMaster </a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#3-NodeManager">3. NodeManager</a><br/>
+<a href="#三YARN工作原理简述">三、YARN工作原理简述</a><br/>
+<a href="#四YARN工作原理详述">四、YARN工作原理详述</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#1-作业提交">1. 作业提交</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#2-作业初始化">2. 作业初始化</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#3-任务分配">3. 任务分配</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#4-任务运行">4. 任务运行</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#5-进度和状态更新">5. 进度和状态更新</a><br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="#6-作业完成">6. 作业完成</a><br/>
+<a href="#五提交作业到YARN上运行">五、提交作业到YARN上运行</a><br/>
+</nav>
+
 ## 一、hadoop yarn 简介
 
 **Apache YARN** (Yet Another Resource Negotiator)  在 hadoop 2 中被引入，作为hadoop集群资源管理系统。用户可以将各种各样的计算框架部署在YARN上，由YARN进行统一管理和资源的分配。
 
-<div width="600px" align="center"> <img src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn-base.png"/> </div>
+<div align="center"> <img width="600px"  src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn-base.png"/> </div>
 
 
 
 ## 二、YARN架构
 
-<div width="600px" align="center"> <img src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/Figure3Architecture-of-YARN.png"/> </div>
+<div align="center"> <img width="600px" src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/Figure3Architecture-of-YARN.png"/> </div>
 
 ####  1. ResourceManager
 
@@ -46,7 +47,7 @@ NodeManager管理YARN集群中的每个节点。NodeManager 提供针对集群
 
 ## 三、YARN工作原理简述
 
-<div width="600px" align="center"> <img src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn工作原理简图.png"/> </div>
+<div align="center"> <img src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn工作原理简图.png"/> </div>
 
 1. Client提交作业到YARN上；
 
@@ -60,7 +61,7 @@ NodeManager管理YARN集群中的每个节点。NodeManager 提供针对集群
 
 ## 四、YARN工作原理详述
 
-<div width="600px" align="center"> <img src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn工作原理.png"/> </div>
+<div align="center"> <img width="600px" src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/yarn工作原理.png"/> </div>